Miniature Diaphragm Gas Pump

What is the Miniature Diaphragm Gas Pump?

A miniature diaphragm gas pump moves air or gas at low flow for sampling, aeration, sensor supply and instrument integration. It offers compact size, low noise and long life for continuous gas handling.

Overview

The miniature diaphragm gas pump uses a small membrane driven by a brushless DC motor, with check valves controlling flow. Free-air flow rates range from 0.1 to 10 L/min and pressures up to about 1 bar, or vacuum of 100 to 200 mbar, suited to gas sampling, aeration, sensor purging and small pneumatic functions. Units measure 5 to 15 cm and weigh under 1 kg, so they integrate easily into analyzers, breath samplers, environmental monitors and medical devices. Wetted materials are typically EPDM, PTFE or silicone to suit the gas. The pump can run continuously for thousands of hours, and versions are available with either a single or dual head, and for pressure or vacuum duty. Electromagnetic noise is low, which matters when the pump sits near sensitive electronics and sensors inside an instrument enclosure.

How does it work?

A diaphragm pump uses a flexible membrane that reciprocates inside a small chamber. On the suction stroke the membrane moves back, the inlet check valve opens and fluid fills the chamber. On the discharge stroke the membrane pushes forward, the outlet valve opens and fluid is expelled while the inlet closes. An eccentric cam or a solenoid drives the membrane, and the valves control direction. Because the fluid never contacts the drive, these pumps are oil-free and tolerate corrosive gases and liquids when the wetted parts are made from PTFE, EPDM or stainless steel. Multiple heads can be connected in series to increase pressure or in parallel to increase flow. In liquid service they are self-priming, can run dry and handle small solids. Typical parameters are flow rate, pressure or vacuum, wetted materials and number of heads.

What are the key features?

• Free-air flow of 0.1–10 L/min
• Pressure up to about 1 bar or vacuum to 200 mbar
• Compact size of 5–15 cm and weight under 1 kg
• Brushless DC motor with low electromagnetic noise
• EPDM, PTFE or silicone wetted parts
• Single or dual head for pressure or vacuum duty

What are the technical specifications?

A typical miniature diaphragm gas pump configuration offers free-air flow rate of 0.1–10 L/min, pressure of Up to about 1 bar, vacuum of Up to 200 mbar, supply voltage of 6, 12 or 24 V DC, wetted material of EPDM, PTFE or silicone and noise level of < 55 dB(A) at 1 m. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Miniature Diaphragm Gas Pump is used in gas and air sampling, sensor purging and supply, aeration and small bioreactors, environmental monitoring instruments and medical device air handling. Across the wider Diaphragm Pumps class, laboratories also deploy it for vacuum filtration and aspiration, gas sampling and transfer and reagent and buffer transfer.

Which standards and certifications apply?

Relevant standards and methods include IEC 61010-1, IEC 61326-1, ISO 21360, ISO 9001 and GB 4793.1. Certification candidates for this model are CE, RoHS and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Install the pump so that the inlet line is short and wide, and keep the pump below the liquid level where possible to help priming. Fit a filter on the inlet to protect the valves from particles, and a trap when pumping condensable vapors. Replace diaphragms and check valves as consumables, because cracks or worn seats cause flow loss and premature failure. Clean wetted parts with compatible solvents and avoid abrasive cleaning. For hazardous gases, exhaust to a safe location. Follow IEC 61010-1 for electrical safety, and verify flow or vacuum against a reference when the pump is used in regulated methods. Record part numbers, service intervals and calibration data so that maintenance and results stay traceable.

How do I select the right Miniature Diaphragm Gas Pump?

Choose a miniature gas pump when integrating air or gas movement into a compact instrument and low noise and long life matter. For higher gas flows choose a larger diaphragm pump. In the RFQ, state flow, pressure or vacuum, gas composition, voltage and expected service hours.

How does it compare with other Diaphragm Pumps variants?

Decide first whether you need vacuum, gas transfer or liquid transfer, since the head design differs. For vacuum and aspiration, choose a diaphragm pump with adequate free-air flow and the ultimate pressure your process needs. For liquid transfer, check the maximum discharge pressure, suction lift and ability to run dry. Match wetted materials to the fluid: PTFE and EPDM suit most solvents and acids, while stainless steel or PTFE-lined heads handle aggressive media. Choose the number of heads for the required flow and pressure, and consider double-diaphragm designs for higher pressure and smoother flow. Confirm the control interface, noise level and duty cycle for continuous instrument use. Specify calibration or flow verification where the pump is part of a metering system.